FROM golang:1.23.1-alpine AS builder

# Set the working directory inside the container
WORKDIR /app

# Copy go mod and sum files
COPY go.mod go.sum ./

# Download all dependencies
RUN go mod download

# Copy the source code into the container
COPY . .

# Build the application
RUN CGO_ENABLED=0 GOOS=linux go build -o /gerbil

# Start a new stage from scratch
FROM ubuntu:22.04 AS runner

RUN apt-get update && apt-get install -y iptables iproute2 && rm -rf /var/lib/apt/lists/*

# Copy the pre-built binary file from the previous stage and the entrypoint script
COPY --from=builder /gerbil /usr/local/bin/
COPY entrypoint.sh /

RUN chmod +x /entrypoint.sh

# Copy the entrypoint script
ENTRYPOINT ["/entrypoint.sh"]

# Command to run the executable
CMD ["gerbil"]